From Form 4473--the long ol' ATF form you fill out when purchasing a gun:
11. h. Are you subject to a court order restraining you from harassing, stalking, or threatening your child or an intimate partner or child of such partner?
If you answer yes, the dealer is not supposed to sell you the gun.
More details from the definitions/explanation section:
Question 11.h. Definition of Restraining Order: Under 18 U.S.C. (squiggly mark) 922, firearms may not be sold to or received by persons subject to a court order that: (A) was issued after a hearing which the person received actual notice of and had an opportunity to participate in; (B) restrains such person from harassing, stalking, or threatening an intimate partner or child of such intimate partner or person, or engaging in other conduct that would place an intimate partner in reasonable fear of bodily injury to the partner or child; and (C)(i) includes a finding that such person represents a credible threat to the physical safety of such intimate partner or child; or (ii) by its terms explicitly prohibits the use, attempted use, or threatened use of physical force against such intimate partner or child that would reasonably be expected to cause bodily injury. An "intimate partner" of a person is: the spouse or former spouse of the person, the parent of a child of the person, or an individual who cohabitates or cohabitating with the person.
So if she has a restraining order placed on him, no problem, but if she has one placed on her that fits the requirements in the definition (parts A, B, and one of the parts of C), then she won't be able to purchase a firearm of any kind. I don't know about local regulations, but mace/pepper spray should not be a problem for her to purchase.
I'll have to agree with the other posts about legal counsel on this one . . . good luck.